Divide and simplify.

A. 3r6 - 5r4
B. 3r7 - 5r5
C. 18r5 - 30r3
D. 3r5 - 5r3


Answer: D

Mathematics

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Solve.A cruise boat travels at its top speed 48 miles downstream in 4 hours and returns to its starting point upstream, also at its top speed, in 6 hours. Find the speed of the stream.

A. 22 mph B. 12 mph C. 10 mph D. 2 mph

Mathematics

Express the sum in sigma notation.1 - 2 + 4 - 8 + 16

A.
B. 2k
C. 2k + 1
D. 2k

Mathematics

Solve the problem.The demand for tickets at a concert hall can be approximated by  where p is the price (in dollars) and q is the quantity demanded. Use implicit differentiation to find and interpret  when  

A.  = -4 means that if the price is increased by $1, the quantity demanded decreases by approximately 4 tickets.
B.  = -  means that if the price is increased by $1, the quantity demanded decreases by approximately  tickets.
C.  = -4 means that if the price is decreased by $4, the quantity demanded increases by 1 ticket.
D.  = -  means that if the price is decreased by $0.25, the quantity demanded increases by 1 ticket.

Mathematics

Find the foci of the given hyperbola.25x2 - y2 = 25

A. (0, ), (0, -)
B. (5, 0), (-5, 0)
C. (, 0), (-, 0)
D. (0, 5), (0, -5)

Mathematics